{
 "schema_version": "1.7.0",
 "id": "x_NXMC-2025-0121",
 "modified": "2026-10-19T02:33:38.839Z",
 "published": "2026-10-18T09:00:52.565Z",
 "summary": "Qwen3-8B-FP8: tokenizer change at add3e8d (2025-04-28)",
 "details": "Qwen3-8B-FP8: EOS changed from 151645 to [151645,151643]; anything fine-tuned or served against the old value stops at a different token; BOS declared as 151643 (was unset); generation defaults changed (do_sample unset to true, temperature unset to 0.6, top_k unset to 20, top_p unset to 0.95); a call that does not pass these explicitly now generates differently (2025-04-28).\n\nRepository: https://huggingface.co/Qwen/Qwen3-8B-FP8. Revisions from add3e8dee80bcfc07aca2fd9edb299ae5c1cb8f7 onward carry this change; a pin at 18a569c78b184814a5dad8f7f00974458e266cc6 or earlier does not.\n\nChanged keys:\n- generation bos_token_id: unset -> 151643 (tokenizer)\n- generation do_sample: unset -> true (generation-defaults)\n- generation eos_token_id: 151645 -> [151645,151643] (tokenizer)\n- generation temperature: unset -> 0.6 (generation-defaults)\n- generation top_k: unset -> 20 (generation-defaults)\n- generation top_p: unset -> 0.95 (generation-defaults)\n\nThis record says what the change does mechanically. It is not a report that anything broke for anyone.",
 "affected": [
  {
   "ranges": [
    {
     "type": "GIT",
     "repo": "https://huggingface.co/Qwen/Qwen3-8B-FP8",
     "events": [
      {
       "introduced": "add3e8dee80bcfc07aca2fd9edb299ae5c1cb8f7"
      }
     ]
    }
   ],
   "database_specific": {
    "model": "Qwen/Qwen3-8B-FP8",
    "previous_revision": "18a569c78b184814a5dad8f7f00974458e266cc6"
   }
  }
 ],
 "references": [
  {
   "type": "INTRODUCED",
   "url": "https://huggingface.co/Qwen/Qwen3-8B-FP8/commit/add3e8dee80bcfc07aca2fd9edb299ae5c1cb8f7"
  },
  {
   "type": "PACKAGE",
   "url": "https://huggingface.co/Qwen/Qwen3-8B-FP8"
  },
  {
   "type": "WEB",
   "url": "https://www.neurarch.com/changes-feeds/models/Qwen/Qwen3-8B-FP8.html"
  }
 ],
 "database_specific": {
  "source": "neurarch model change tracker",
  "model": "Qwen/Qwen3-8B-FP8",
  "kind": "tokenizer",
  "classes": [
   "tokenizer",
   "generation-defaults"
  ],
  "changed_keys": [
   {
    "file": "generation",
    "key": "bos_token_id",
    "before": null,
    "after": 151643,
    "class": "tokenizer"
   },
   {
    "file": "generation",
    "key": "do_sample",
    "before": null,
    "after": true,
    "class": "generation-defaults"
   },
   {
    "file": "generation",
    "key": "eos_token_id",
    "before": 151645,
    "after": [
     151645,
     151643
    ],
    "class": "tokenizer"
   },
   {
    "file": "generation",
    "key": "temperature",
    "before": null,
    "after": 0.6,
    "class": "generation-defaults"
   },
   {
    "file": "generation",
    "key": "top_k",
    "before": null,
    "after": 20,
    "class": "generation-defaults"
   },
   {
    "file": "generation",
    "key": "top_p",
    "before": null,
    "after": 0.95,
    "class": "generation-defaults"
   }
  ],
  "impact": {
   "memory": false,
   "serving": true,
   "tokenizer": true,
   "licence": null
  },
  "breaking": true,
  "breaking_rule": "https://www.neurarch.com/changes-feeds/advisories/index.json#breaking_rule",
  "consequence": {
   "params": null,
   "weightsGbBf16": null,
   "trainPeakGb": null,
   "fingerprint": null,
   "context": null,
   "eos": {
    "before": 151645,
    "after": [
     151645,
     151643
    ]
   },
   "bos": {
    "before": null,
    "after": 151643
   }
  },
  "commit_date": "2025-04-28T18:16:15.000Z",
  "detected_at": "2026-10-18T09:00:52.565Z",
  "detected_by": "backfill",
  "days_since_first_commit": 0,
  "license": "CC-BY-4.0"
 }
}